VDAS TD1005 - Experiment

FREE AND FORCED CONVECTION EXPERIMENT

PDF datasheet

Bench top apparatus that illustrates free and forced convection from different transfer surfaces.

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FREE AND FORCED CONVECTION EXPERIMENT

The bench-mounting equipment includes a vertical duct that holds the chosen heat transfer surface and all instruments needed. 

TecQuipment include three different common heat transfer surfaces with the equipment:

  • A Flat Plate
  • A Pinned Surface – similar to a tubular heat exchanger
  • A Finned Surface – similar to the fins on air-cooled engines or electrical heat sinks 

Each surface has its own built-in variable-power electric heater. Students choose which surface they need to test and fit it to the duct using simple fixings.

For free convection tests, the heated air rises from the surface and up the duct. For forced convection tests, a variable-speed fan draws air up through the duct and across the surface. Thermocouples measure the air temperature upstream and downstream of the surface and the temperature at the heat transfer surface. The downstream probe moves in a traverse mechanism to measure the temperature distribution across the duct, allowing calculation of the bulk outlet temperature. An additional probe allows students to measure the temperature distribution along the extended surfaces of the pinned and finned heater transfer surfaces. A sensitive anemometer measures the air velocity. 

Two controls allow students to set different air velocities and heater power for a full range of tests. 

A digital display shows the heater power, air velocity and the temperatures measured by the thermocouples. 

You can do tests with or without a computer connected. However, for quicker tests with easier recording of results, TecQuipment can supply the optional Versatile Data Acquisition System (VDAS®). This gives accurate real-time data capture, monitoring and display, calculation and charting of all the important readings on a computer.

VIDEO
  • Comparing free and forced convection for different surfaces
  • Comparison of free convection from vertical and horizontal (finned) surfaces
  • Comparison of heat transfer surface efficiency
  • Comparing the coefficient of heat transfer and Nusselt Number for forced and free convection
  • Temperature distribution along finned and pinned surfaces
case study
University of Northwestern St Paul Builds New Engineering Program

When the University of Northwestern St Paul, located in Minnesota in the USA, set out to build new labs while meeting USA degree accreditation requirements, they scoured the educational teaching equipment market for a supplier that could deliver:

  • High quality products and customer service
  • Competitive prices
  • Purpose-built equipment with teaching flexibility in mind
  • A single supplier source for the majority of the practical teaching needs

Read the full case study here. 

FREE AND FORCED CONVECTION EXPERIMENT
SUPPORTING PRODUCTS
TD1 - Experiment

Trolley mounted, mobile apparatus that demonstrates forced convection in pipes and heat transfer theory.  Illustrates the derivation of the value of Nusselt number, determination of the Stanton number and determination of the validity of the Reynolds analogy for air.

VDAS TD1002 - Experiment

A bench top base unit for demonstrating different methods of heat transfer. Requires at least one of the four optional experiments.

VDAS On Board TD1011V - Experiment

Trolley mounted, mobile apparatus that demonstrates how different types of heat can transfer over a range of pressures; helps the understanding of the Stefan Boltzman constant.

VDAS TE93 - Experiment

Bench top apparatus with a control and instrument unit for studies into the principles and performance of heat exchangers.

VDAS-B (mkII) - Ancillary

A bench mounting versatile data acquisition system (VDAS) to allow computer-based data capture for a wide range of TecQuipment products.

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